<!DOCTYPE html>
<html lang="cn">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>

</body>

</html>
<script>

    class User {
         number1 = 1111;
        constructor(age) {
            this.age = age;
            this.name = name;
        }
    }
    let user = new User(43);
    User.sex='dd'
    console.log(user);


</script>